Seaview also sells those stainless steel mesh too, its usually displayed alongside the plants retail area.
I guess you can also get stainless steel mesh from hardware shops too, just have to make sure they are marine-grade steel that wouldn't corrode/rust in the tank.
As for the edges of the steel mesh, just trim them with a wire cutter or scissors and bend the edges downwards, that will avoid sharp edges poking out.
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